Dispersal valve with nesting canisters

ABSTRACT

Containers for use in a dispersal with the containers enabling a fluid mixing stream to separately and controllably disperse two different water treatment materials into a water treatment system.

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application is a continuation of Ser. No. 09/707,142 TiltedNestable Container and Improved Water Composition filed Nov. 6, 2000which is a division of application Ser. No. 08/719,482 titled TiltedNestable Container and Improved Water Composition filed Sep. 25, 1996now U.S. Pat. No. 6,210,566.

FIELD OF THE INVENTION

[0002] This invention relates in general to nestable canisters and animproved bactericide/algaecide for use in water treatment and moreparticularly to nestable canisters that can be inserted into a dispenserthat normally hold a single canister to provide for simultaneous butseparate dispensing of dispersants and minerals to kill both bacteriaand algae in recirculating water systems commonly used in swimmingpools, spas and the like.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

[0003] None

REFERENCE TO A MICROFICHE APPENDIX

[0004] None

BACKGROUND OF THE INVENTION

[0005] The concept of treating water with chemicals such as chlorine orbromine to kill bacteria is old in the art. One of the methods ofdispensing bacteria killing chemicals into the water is to use adispersal valve that allows a portion of the water to flow through thewater soluble chemical which is located in a single compartment withinthe dispersal valve. Typically, a chemical such as chlorine or ametallic compound such as silver is used to kill the bacteria.

[0006] The prior art further includes devices that holds two solids andseparately dispenses the dissolvable solids into the water as shown inthe U.S. Pat. No. 3,378,027. The patent shows a water treatmentapparatus having two separate compartments each for holding adissolvable solid chemical therein. Once the chemicals are dissolvedthey are allowed to flow into a storage tank.

[0007] Still another apparatus for dispensing two different chemicals isshown in U.S. Pat. No. 5,251,656 which shows a multiple chemical feederfor swimming pools. The feeder has a first compartment for holding acanister containing a solid chemical and a second compartment forholding a collapsible container having a liquid chemical dispersant. Thesolid chemical is dissolved and dispensed by flowing water through it.The liquid chemical is dispensed by exerting pressure on the outside ofa collapsible container to force the liquid chemical out of thedispenser and into the system. The chemicals are maintained separatefrom one another until they are introduced into the fluid stream. In thepresent invention the one portion of a bifurcated fluid stream flowsthrough a canister holding a chemical dispersant and the other portionflows through a canister containing minerals which kill algae andbacteria to provide a system where the levels of the chemicaldispersants can be maintained at a lower level without raising the levelof bacteria in the system. After passing through the canisters thebifurcated stream is reunited and then directed into the liquid streamflowing through the dispersal valve.

[0008] The present invention allows one to use a prior art singlecompartment dispersal valve to hold nestable canisters wherein twodifferent materials can be separately dissolved and simultaneouslydispersed into a bifurcated fluid mixing stream with the bifurcatedfluid mixing steam subsequently combined into a single stream fordelivering the chemical and minerals dispersants into the liquid streamthrough a single dispersal valve. The nestable canisters are placeablewithin existing dispersal valves that normally contain only a singlecanister.

[0009] The nestable canisters provide for multiple water treatment in asingle step by providing one canister that can dispense a dispersantsuch as chlorine and a second nestable canister that contains mineralssuch as an improved algaecide to provide both bacteria killing and algaekilling capability from a dispersal valve that normally dispenses only asingle dispersant at a time. The invention further includes an improvedbactericide and algaecide comprising a zinc carrier having a silvercoating which is located in an acid absorbing bed of limestone. The zincand silver inhibit bacteria and algae while the limestone neutralizesacids formed during the water treatment process. The combination of thechemical treatment and the mineral treatment provides a treatment systemthat lowers the necessary amount of chemical in the pool as the bacteriais killed by contact with the minerals in the second canister.

BRIEF DESCRIPTION OF THE PRIOR ART

[0010] U.S. Pat. No. 3,378,027 shows a water treatment apparatus havingtwo separate compartments each for holding a dissolvable chemicaltherein. Once the chemicals are dissolved with water the dissolvablechemicals are allowed to flow into a storage tank.

[0011] U.S. Pat. No. 4,504,387 shows a water purification system thatuses charcoal granules impregnated with silver ions to kill bacteria.

[0012] U.S. Pat. No. 4,608,247 discloses a composition for bacterialtreatment of water that uses a combination of a carrier with a layer ofelemental silver on the carrier. The silver is released by themechanical interaction of adjacent particles. The silver and carrier islocated in a filler material that reduces the rate of release of thesilver into the fluid stream.

[0013] U.S. Pat. No. 4,610,783 shows a system for the control of algaewhere the water is forced through staggered holes located in a set ofzinc disks.

[0014] U.S. Pat. No. 4,642,192 shows a method for treating fluid toremove dissolved chlorine and nitrates by passing the water through ametal particulate matter such as aluminum, iron, steel, zinc, copper ormixtures and alloys thereof.

[0015] U.S. Pat. No. 4,662,387 discloses a an inline dispersal valvewith a canister keyed to the dispersal valve.

[0016] U.S. Pat. No. 4,867,196 shows a dispenser with 3 chambers toobtain uniform and controlled release of the calcium hypochlorite.

[0017] U.S. Pat. No. 4,935,116 shows a canister that contains twodissimilar metals that are spaced from one another with one of themetals being silver to produce a simple voltaic cell that release silverions into the water as the water flows between the two dissimilarmetals.

[0018] U.S. Pat. No. 4,964,185 shows a system for dispensing a chemicalinto a fluid stream and for determining how much of the chemical hasbeen dispensed into the fluid stream.

[0019] U.S. Pat. No. 5,041,219 discloses a dual chamber water filterwith a metallic filtration particulate located in the inlet chamber anda charcoal filtration particulate located in the outlet chamber with themetallic filtration particulate positioned so that water flows upwardthrough it to reduce compaction of the metallic filtration particulate.

[0020] U.S. Pat. No. 5,218,983 and King U.S. Pat. No. 5,076,315 disclosea dispersal valve with a canister for dispensing a water solublechemical into a fluid stream.

[0021] U.S. Pat. No. 5,251,656 shows a multiple chemical feeder forswimming pools that has a first compartment for holding a canistercontaining a solid chemical and a second compartment containing a liquidchemical. The solid chemical is dissolved by flowing water through it.The liquid chemical is dispensed by exerting pressure on the outside ofa collapsible container to force the liquid chemical out of thedispenser and into the system.

[0022] U.S. Pat. No. 5,352,369 discloses a method of treating water tokill bacteria using a silver catalyst which comprises and aluminummatrix with silver deposited thereon and the aluminum matrix and thesilver having been heated between 750° C. and 1050° C.

[0023] U.S. Pat. No. 2,107,456 discloses a portable water treatingsystem where a bed of germicidal filter material that has a activatedcarbon filter stacked on the germicidal filter materiel.

[0024] U.S. Pat. No. 4,092,245 shows a liquid purification system usinga biocatalyists formed by wet processing silver oxide, zinc oxide andlampblack.

[0025] U.S. Pat. No. 4,407,865 discloses a process of coating asterilizing filter material comprised particulate silver material suchas sand with metallic silver for sterilizing water.

BRIEF DESCRIPTION OF THE INVENTION

[0026] Briefly, the present invention comprises nestable canisters foruse in dispersal valves that normally hold only a single canister withthe nestable canisters suitable for replacing single canisters thatdisperse a chemical with a first canister to disperse to a chemicaldispersant and a second canister to bring the water in the valve intocontact with bacteria killing minerals in the in the second canister.The dual canisters permit simultaneously but separate treatment of atemporarily bifurcated fluid mixing stream flowing through the set ofdispersal valve ports that are normally used for dispensing only onechemical dispersant into a fluid mixing stream flowing through thedispersal valve. In addition the nestable canisters are provided with aan improved bactericide and algaecide for killing bacteria and algae inthe water.

BRIEF DESCRIPTION OF THE DRAWINGS

[0027]FIG. 1 is a pictorial view of a prior art dispersal valve;

[0028]FIG. 2 is a partial cut-away view of the dispersal valve of FIG. 1with a single canister;

[0029]FIG. 3 is a perspective view of the canister for use in thedispersal shown in FIG. 1 and FIG. 2;

[0030]FIG. 4 is a perspective view of a first nestable canister for usein the dispersal valve of FIG. 1;

[0031]FIG. 4A is a bottom view of the nestable canister shown in FIG. 4;

[0032]FIG. 4B is a top view of the nestable canister shown in FIG. 4;

[0033]FIG. 5 is an exploded view of the nestable canister of FIG. 4together with a manifold for connecting the nestable canister to adispersal valve;

[0034] Fig 5A is a top view of the manifold of FIG. 4;

[0035]FIG. 5B is front view of the manifold of FIG. 4;

[0036]FIG. 6 is a front view of a second nestable canister for nestingwithin the canister of FIG. 4;

[0037]FIG. 7 is a partial cut-away side view of a second nestablecanister of FIG. 6;

[0038]FIG. 8 is an exploded perspective view showing the nestingrelationship of the nestable canisters of FIG. 4 and FIG. 6;

[0039]FIG. 9 shows a partial cutaway view of a side elevation of adispersal valve contain nestable canisters therein; and

[0040]FIG. 10 shows a cross sectional view taken along lines 10-10 ofFIG. 9 with the inner nestable canister removed for clarity.

DESCRIPTION OF THE PREFERRED EMBODIMENT

[0041] The present invention of nestable canisters for simultaneouslybut separately treating water in a temporarily bifurcated fluid mixingstream is usable in dispersal valves of the type normally used fordispensing a single chemical dispersant into pools, spas and the like.

[0042]FIG. 1 reference numeral 10 general identifies such a prior artdispersal valve for normally and controllable dispersing a single soliddispersant chemical such as bromine or chlorine tablets into a liquid.Dispersal valve 10 includes a housing 17 having a removable cover 11fastened thereto by threads or the like. Located on top of cover 11 isan air vent 16 that can be opened to bleed air from dispersal valve 10.Located on top center of cover 11 is a visual indicator means 15comprising an outer transparent, hollow sight member that permits anobserver to peer through the sight member to determine if any visualindication means is present in the sight member.

[0043] Dispersal valve 10 which is shown in grater detail in my U.S.Pat. No. 5,076,315 includes a fluid inlet 13 on one side of housing 17and a fluid outlet 12 located on the opposite side of housing 17. Arotary plug 14 permits a user to control the velocity of the fluidmixing stream that can be directed through the dispersal valve. Afurther example of a dispersal valve with a rotatable plug forcontrollable directing a fluid mixing stream through the dispersal valveto dispense materials such as bromine and chlorine into swimming pools,hot tubs, spas, and the like is shown in greater detail in U.S. Pat. No.4,662,387. A beneficial feature of such a dispersal valve is that themixing of the dispersant chemicals is done completely within thedispersant valve so that when the fluid mixing stream returns to theliquid stream through the dispersal valve the mixing stream can befurther mixed with the liquid stream flowing through the dispersal valvethus assuring that higher concentrations of dispersant chemical are notdirectly introduced into the liquid stream which is returned to the poolor spa. That is, the dispersal valve ensures that the dispersant isalways introduced in diluted form into the liquid stream so that thechances of human contact with high concentrations of dispersants in thepool or the spa is minimized.

[0044]FIG. 2 illustrates prior art valve 10 and a prior art canister 130in cross section with chlorine tablets 9 located in a trough 153. Theheight of trough 153 is indicated by h and the liquid level in trough153 is indicated by L. P₂ indicates he pressure at the inlet passage 151, P₁ indicates the pressure at the outlet 152 and P₃ indicates thepressure in the air pocket 150. In the embodiment shown the tablets inair pocket P₃ remain free of contact with liquid and remain in anundispensed state. However, the tablets 9 located in trough 153 are incontact with the liquid resulting in dispensing of dissolvable orerodible tablets directly into the liquid in proportion to the rate ofliquid flowing past the tablets and the amount of tablets in contactwith the surface of the tablets. Consequently, the use of a dispersalvalve that directs only a portion of a fluid mixing stream through thetrough permits a user to controllable dispense the dispersant in thetrough at a substantially constant rate over an extended period of time.In addition the use of a canister that continually funnels unspentdispersant into the trough permits one to controllable dispense materialat a substantially constant rate for two weeks or longer.

[0045]FIG. 3 shows a perspective view of a prior art canister 130 havinga hand grip ridge 131 with a finger recess 132 to permit a user to liftcanister 130 out of a dispersal valve. Canister 130 comprises a housinghaving an upper region 133 and a lower region having a first fluid port134 and a second fluid port 135. A cap 136 extends over ports 134 and135 to seal the canister during storage. A break line 138 extends aroundeach of the ports to permit cap 136 to be quickly separated fromcanister when the canister is in use. A mating line 137 identifies wherethe top half and the lower half of canister have been joined together toform a closed canister.

[0046]FIG. 4 shows a perspective view of an annular nestable canister 20of the present invention for use in dispersal valve 10. Nestablecanister 20 nests with a second nestable canister 40 (FIG. 6) to providea multiple delivery or dispensing system. Nestable canister includes anouter cylindrical exterior 20 a that enables canister 20 to be insertedinto the existing dispersal valves in a manner that a single canisterwould be inserted. In Addition nestable canister 20 has a central areawhere a second nestable canister can be placed. Nestable canister 20includes relief areas 20 r to enable a person to grasp nestable canister20 when it is within a dispersal valve. Nestable canister 20 is madefrom a rigid polymer plastic and normally stands in a upright positionin a dispersal valve.

[0047]FIG. 4A shows a bottom view of a nestable canister 10 showing aradial extension 25 having a canister inlet 21 and a canister outlet 22.A slot 23 in canister 20 provides a key for ensuing that the canister isproperly inserted into the dispersal valve that has a correspondingmating tab.

[0048]FIG. 4B shows a top view of canister 20 revealing the lower radialinward extension 25 that holds means for directing fluid in and out ofcanister 20. Radial inward extension 25 extends only partway across thebottom portion of canister 20 leaving a central opening in canister 20Reference numeral 24 identifies the central opening 24 in nestablecanister 20 to enable the nesting and operation of a second canisterwithin canister 20.

[0049]FIG. 5 shows an exploded cut-away view of nestable canister 20 anda manifold 30 that can be used to connect a set of nestable canister toan existing dispersal valve. Nestable canister 20 includes an uppercylindrical section 26 having an annular chamber defined by acylindrical inner wall 26 b and an outer cylindrical wall 26 a. Locatedwithin the annular chamber defined by walls 26 b and 26 a is alongitudinal rib 27 that forms both a separator and spacer between innerwall 26 b and outer wall 26 a. Rib 27 extends upward from cylindricalbase 28. The rib 27 terminate in the top portion of section 26 in theannular chamber 31 that extends around the top portion of cylindricalsection 26.

[0050] Longitudinal rib 27 divides the space between walls 26 b and 26 aso that water from the inlet to canister 20 cannot flow directly to theoutlet of the canister 20 but must pass through the water treatmentminerals 31 in canister 20. The minerals for the water treatment areshown located between the inner wall 26 b and outer wall 26 a and arepreferably a contact water treatment mineral 35 for removal of bacteriaand algae from the water.

[0051] In the embodiment shown the water treatment mineral 35 is abacteria and algae inhibiting mineral comprising zinc particles and zincparticles coated with silver which are dispersed within an acid absorbersuch as limestone which can absorbs acids generated within thedispenser. In the embodiment shown the water treatment composition forkilling bacteria and inhibiting algae growth in a recirculating watersystem comprises a plurality of zinc particles having a maximumdimension on the order of ⅛ of an inch with the zinc particle having anexterior irregular surface and a coating of silver located on theexterior irregular surface of the zinc particles. The silver issufficiently thick so as to kill bacteria that comes into contact withthe silver. In most applications the water treatment composition has acoating of silver which is about 1% of the weight of the silver coatedzinc particle. in general the water treatment composition of chemicaldispersants used in canister 20 includes zinc particles havingsufficiently small dimensions so that sufficient contact can be madewith the silver on the zinc to provide effective killing of bacteria andalgae. In addition to the silver coated zinc particles the compositionincludes uncoated zinc particles dispersed throughout the mixture of thedispersant composition in nestable canister 20 as the zinc particlesprevent algae from growing. It is believed that the zinc ions from thecanister enter the pool and kill algae in the pool. Thus the secondcanister provides insitu water treatment by killing bacteria that comeinto contact with the silver as well as the usually benefits ofdispersion of materials into the water. With the use of a contact typebactericide in the second canister it allows the present invention toprovide insitu killing of bacteria which makes it possible to lower thelevels of chlorine used in the pools. That is, chlorine levels in thepool or spa do not need to maintained at high levels as a portion of thebacteria killing can be done outside the pool or spa by the contactbactericide in the second canister. Thus the present invention providesa method for reducing the chlorine levels in a body of water withouthaving to maintain the chlorine at high levels.

[0052] The canister 20 is unique in that minerals within canisterinclude an acid absorber with the acid absorber available for absorbingacids which are generated by the production of chlorine in anotherdispensing canister 40 (FIG. 6) located in the fluid system. Thus adependent relationship exists between the two canisters with thecanister 40 carrying materiel that absorbs undesirable by products fromthe chemical dispersant in the first canister.

[0053] To illustrate the operation of nestable canister 20 referenceshould be made to FIG. 5 which shows base 28 and base plate 29 thatsealably fastens to each other with the base 28 further sealably fastensto Member 26. FIG. 5 shows that extension 25 extends only across thebottom portion of nestable container 20. Extension 25 has an internalpassage (not shown) that directs fluid from inlet 21 vertically upwardinto half of an annular chamber defined on the ends by end longitudinalrib 27 a and end longitudinal rib 27 b and on the sides by the outercylindrical member 28 a and inner cylindrical member 28 b. The threearrows extending upward from base 28 indicate the direction of incomingflow in nestable canister 20. That is, fluid enters inlet 21 and isdirected by the passages in extension 25 into the half annular inletchamber where the fluid travels upward though the dispersant as indictedby the arrows. Once the fluid reaches the top of canister 20 it flowsover the end of longitudinal rib 17 and downward to the outlet incanister 20. In order for the fluid to be discharged from the nestablecontainer the fluid must flow downward through additional mineraldispersant. wherein it is discharged from the canister after it passesinto extension which through an internal passage (not shown) directs thefluid to outlet 22.

[0054] Thus in fluid operation of nestable canister 20 a portion of thefluid mixing stream from a dispersal valve 10 is directed through inlet21 wherein it flows upward through the dispersant located in one side ofnestable canister until the fluid reaches the top of canister 20. Oncethe fluid passes around rib 17 the fluid flows downward through asimilar chamber containing additional dispersant until the fluid isdischarged through outlet 22.

[0055] Locate below nestable canister 20 is a manifold 30 for use inadapting the nestable canister for use in existing dispersal valves. Incertain applications manifold 30 is not needed; however, in someapplications the manifold can be used to allow a wide variety ofnestable canisters to be used in various types of dispersal valves.

[0056]FIG. 5 A shows a top view of manifold 30 and FIG. 5B show a sideview of manifold 30 while FIG. 5 reveals the interior of manifold 30.Manifold 30 includes a first extension 30 a for engaging an outlet portof a dispersal valve and a second extension 30 b for engaging an inletport of a dispersal valve. FIG. 5a shows that the top of manifold 30includes an enlarged outlet 30 c for engaging with inlets from two ormore nestable canisters and an enlarged inlet 30 d for engaging withoutlets from two or more nestable canisters.

[0057]FIG. 6 and FIG. 7 show a second nestable canister 40 therein. FIG.6 shows a side view of nestable canister 40 and FIG. 7 shows a partialcutaway view of nestable canister 40. Nestable canister 40 comprises acylindrical outer wall 40 a with reinforcing groves 40 b to providestiffness to internally nestable canister 40. A first finger grip 41 anda second finger grip 42 enable the nestable canister 40 to be liftedfrom or lowered into the nestable canister 20. Nestable canister ispreferably made from a polymer plastic or the like.

[0058] Nestable canister 40 includes an inlet port 43 for engaging aportion of the inlet flow from a dispersal valve and a fluid outlet portfor directing the portion of the fluid back into the main liquid stream.The cutaway view shows dispersant tablets 9 located within nestablecanister 40. Tablets 9 can typically be chlorine tablets for killingbacteria. The operation of nestable canister 40 is similar to theoperation of nestable canister 130 shown in FIG. 2 except that nestablecanister 40 does not received all the fluid mixing stream from valveinlet member 134. That is the fluid mixing stream that flows through thedispersal valve is bifurcated so that a first portion of the incomingfluid mixing stream is diverted through the dispersant in nestablecanister 40 and a second portion of the fluid mixing stream is directedthrough the nestable canister 20.

[0059]FIG. 8 is an exploded view illustrates that nestable canister 40can be axially inserted within the nestable canister 20. Nestablecanister 40 includes an outer dimension designated by W₁ and nestablecanister 20 includes an inside dimension designated by W₂ with W₂ lessthan W₁ so that canister 40 can be freely inserted within the chamberformed by the interior of canister 20. FIG. 8 shows the two nestablecanisters 40 and 20 prior to the insertion into a nesting relationshipwith each other.

[0060]FIG. 9 shows a partial back cutaway view of dispersal valve 10with nestable canister 20 and nestable canister 40 located in nestingrelationship within the space formally occupied by canister 130.Manifold 30 directs a fluid mixing stream from valve inlet 134 intovalve inlet 30 a and manifold outlet 30 b directs the fluid mixingstream together with the two dispersant back into the main liquidstream.

[0061]FIG. 10 shows a cross sectional view of canister 10 with the innernestable canister 40 removed to show that nestable canister 20 extendsover a portion of first manifold port 30 a and second manifold port 30b. Thus there is a fluid path that provides for receiving a portion ofthe fluid mixing steam and allowing the portion of the fluid mixingstream to flow through the outer nestable canister 20. The remainingportion of the mixing fluid stream which is directed through the otherportions of fluid ports 30 a and 30 b is directed through the secondnestable canister which has inlets and outlets positioned to receivedand dispenses the other portion of the mixing fluid stream back into thedispersal valve. Thus the fluid mixing stream is bifurcated allowingportions of the bifurcated fluid mixing stream to be simultaneously butseparately mixed with different chemical dispersants. After mixing ofthe chemical dispersant with the bifurcated fluid stream the twoportions of the stream are combined in the dispersal valve before beingdirected back into the main liquid stream flowing through the dispersalvalve.

[0062] Thus the present invention is a water treatment system thatenables a person to dispense a single chemical dispersant or multiplechemical dispersants into the pool or spa by merely selecting theappropriate canisters for use in the dispersal valve to thereby providea water treatment system for killing bacteria and algae in arecirculating water system. That is, with one canister including a firstbacteria killing chemical such as a solid chlorine tablet or stick onecan dispense chlorine into the recirculating water system to kill thebacteria in the water system and another canister, which includes amineral having insitu bacteria killing capabilities one can maintain thelevel of chlorine lower. That is, one can kill bacteria on contact byhaving a plurality of zinc particles having at least a partial coatingof silver. In the embodiment shown the water treatment system isinstalled in a single compartment dispersal valve with the firstcanister and the second canister located in nesting relationship in thecompartment of the dispersal valve. Not only can multiple chemicalsdispersants and minerals be dispensed into the system one can vary thedispensing rate by using a valve on the dispersal valve for varying theamount of water flowing through the dispersal valve. A further benefitof the invention is that the use of multiple nestable containers can beused to lower the amount of water circulated through the dispersant inthe valve. For example, a normal setting of the dispersal valve with asingle canister might deliver chemical dispersants at a rate of x perhour. With the present invention one of the multiple canisters mightdeliver chemical dispersants at a rate of 0.7x per hour. Thus thepresent invention allows the user to lower the dispersal rate byinserting a second canister to receive a portion of the mixing fluidstream in the dispersal valve. For example, the below table lists theoutput of a dispersal valve with a single canister containing chlorinetablets to a dispersal value containing a set of nestable canisters onecontaining chlorine tablets and the other containing zinc particles,silver coated zinc particles and limestone. Chlorine Chlorine & MineralsDial Setting (oz/chlorine per hour) (oz/chlorine per hour) 0 .016 .014 3.135 .080 4.5 .149 .142 6 .677 .313 9 1.630  .372

[0063] Thus a feature of the present invention is that the use of thenestable containers can be used to change the calibration of the valveto allow the dispersal valve to be used with different dies of water.

[0064] It is believed the silver metal surfaces are effective in killingbacteria due to the fact the bacteria cell walls contain variouschemical groups that have an affinity for silver. When the bacteria cellwall comes in contact with the silver, the cell is strongly bound to thesurface of the silver by the various chemical. groups. The process alonehelps prevent the bacteria from multiplying. However, in the presence ofdissolved oxygen or very low levels of chlorine a further action canoccur in which the various chemical groups react chemically with thesurface of the silver to kill the bacteria by damaging or destroying thecell walls of the bacteria thus making the silver an ideal insitukilling material for use in the invention.

[0065] Zinc metal is believed to react in a similar manner;however, zincis more effective in keeping the silver clean. That is, the chemicallybacteria on the silver surface combine with the zinc to produce aregenerated silver surface and zinc ions dissolved in water plus celldebris. The cell debris can be trapped on a filter in the mineralchamber. In the above example the minerals in the second canistercomprised zinc (35.7 grams). silver coated zinc (237 grams) andlimestone (907.2 grams). The zinc acts as a carrier for the silver whichis applied to the zinc in form of a silver halide emulsion. The emulsionis applied in the form of paste and fixed through the use of acombination of heat, halogen light and a chemical developer. This fixingprocess converts the silver halide emulsion to silver which securelyadheres to the zinc during the fixing process. The end result is aparticle that has a complete coating of silver (about 1% silver to theweight of the zinc) The limestone ad a nominal size of about ¼ of aninch. Thus the combination of a chlorine and silver and zinc dispersantcomposition is effective in killing bacteria and killing algae with thechlorine providing the fast killing action and the silver and zincproviding the long term killing action.

[0066]FIG. 11 shows an alternate embodiment of the invention wherein thenestable canister are formed into two longitudinally extendinghemicylindrical canisters 60 and 61. Canisters 60 and 61 are separatecanisters for holding the contents in isolation from each other. In thecanisters 60 a and 61 the fluid from the dispersal valve is split and issent upward through the inlet ports 62 and 63 and through the respectivecanister where it is discharged through the outlet ports 65 and 64.

1. In a water treatment system: a first container, said first containerincluding a first water treatment material for dispersing the firstwater treatment material into a stream of water flowing through saidfirst container, said first container including a pocket of air to limitthe amount of the first water treatment material in contact with thestream of water; and a second container, said second container holding asecond water treatment material therein, said second container having aninlet and an outlet to allow water to flow into and out of the secondcontainer to thereby dispense the second water treatment materialtherein into the water treatment system whereby the first and secondcontainer are located in a member for directing a stream of watertherethrough.
 2. In the water treatment system of claim 1 wherein themember comprises a dispersal valve having a compartment for holding thefirst container and the second container in a side-by-side relationship.3. In the water treatment system of claim 1 the member has a singlecompartment to hold said first container and said second container. 4.In the water treatment system of claim 1 wherein the second watertreatment material comprises silver metal for releasing silver ions. 5.In the water treatment system of claim 1 wherein the second watertreatment material comprises silver chloride for releasing silver ions.6. In the water treatment system of claim 1 wherein the second watertreatment material includes zinc.
 7. In the water treatment system ofclaim 1 wherein the first container nests substantially within saidsecond container.
 8. In the water treatment system of claim 1 includinga valve in the member for varying the amount of water flowing throughthe first container to vary a dispensing rate of the first watertreatment material from said first container.
 9. In the water treatmentsystem of claim 1 wherein the first water treatment material comprisessolid chlorine.
 10. A water treatment system comprising: a firstcontainer, said first container including a first water treatmentmaterial for dispersing a first water treatment material into a streamof water flowing through said first container; and a second container,said second container holding a second water treatment material therein,said second container having an inlet and an outlet to allow water toflow into and out of the second container to thereby dispense the secondwater treatment material therein into the water system whereby the firstand second container recieve a stream of water therethrough; and amember for manually controlling the amount of water flowing through thefirst container to limit the rate of dispersal of the first watertreatment material from the first container.
 11. In the water treatmentsystem of claim 10 wherein the first and second container are in aside-by-side relationship to each other to permit removable of one orthe other therefrom.
 12. In the water treatment system of claim 10including a key for ensuing that the containers are properly inserted inthe dispersal valve.
 13. In the water treatment system of claim 10wherein the first water treatment material in the first container is asolid chlorine for dispensing into the stream of water flowing thoughsaid first container and an air pocket in the first container limits thecontact of chlorine with the stream of water to limit the rate ofdispensing the solid chlorine into the stream of water.
 14. In the watertreatment system of claim 10 wherein the member for manually controllingthe amount of water flowing through said first container is located in adispersal valve holding said first container and said second container.15. In the water treatment system of claim 13 wherein the member formanually controlling the amount of water is a rotary plug.
 16. In thewater treatment system of claim 14 wherein the containers have a top anda bottom with the inlets and outlets thereto located on the bottom ofsaid containers.
 17. In the water treatment system of claim 14 whereinone of the containers contains a bactericide and the other containercontains an algaecide.
 18. In the water treatment system of claim 14wherein the second container nests substantially within said firstcontainer.
 19. In a water treatment system: a first container, saidfirst container including a first water treatment material fordispersing a water treatment material into a stream of water flowingthrough said first container, said first container limiting the amountof the first water treatment material in contact with the stream ofwater; and a second container, said second container proximate saidfirst container said second container holding a second water treatmentmaterial therein, said second container having an inlet and an outlet toallow water to flow into and out of the second container to therebydispense the second water treatment material therein into the watersystem whereby the first and second container are positioned forreceiving a stream of water for water treatment.
 20. A dispersal valvefor dispensing a bacteria killing composition into a water systemcomprising: a passage for directing a fluid stream through saiddispersal valve; a compartment located in said dispersal valve; an inletlocated in said dispersal valve for directing a fluid mixing stream intosaid compartment; an outlet located in said dispersal valve fordirecting the fluid mixing stream out of said compartment; a valvelocated in said dispersal valve for controlling the amount of waterdirected into the inlet located in said dispersal valve; a firstnestable canister located in said compartment, said first canisterincluding a first quick acting solid water soluble chemical for killingbacteria with said canister having an inlet for capturing a firstportion of the fluid mixing stream and directing the first portion ofthe fluid mixing stream into contact with the first water solublechemical in said first canister, said first canister including an outletfor directing the first portion of the fluid mixing stream with abacteria killing chemical back into the fluid stream; a second nestablecanister located in said compartment, said second canister including amineral for killing bacteria with said second canister having an inletfor capturing a second portion of the fluid mixing stream and directingthe second portion of the fluid mixing stream into contact with themineral in said second canister, said second canister including anoutlet for directing the second portion of the fluid mixing stream backinto the fluid stream through a second portion of the outlet located insaid dispersal valve.
 21. A bactericide delivery system for use withdifferent bactericides comprising: a first nestable canister; said firstnestable canister having an open central interior and an annular chamberfor holding a first bactericide therein, said first nestable canisterincluding an inlet for directing a portion of a fluid mixing stream intothe first nestable canister and an outlet for directing the portion ofthe fluid mixing stream back into the fluid; a second nestable canister,said second nestable canister located at least partially within the opencentral interior, said second nestable canister holding a bactericidedifferent from said first chemical bactericide with said second nestablecanister having an inlet for directing a further portion of the fluidmixing stream into the second nestable canister and an outlet fordirecting further portion of the fluid mixing stream out of the secondnestable canister with said first inlet of said first nestable canisterand said second canister positioned adjacent to each other so as toshare the fluid mixing stream diverted toward said canisters to enablethe fluid mixing stream to provide simultaneously but separate treatmentof the fluid with two or more chemical materials.
 22. In a watertreatment system: a first container, said first container including abacteria killing chemical for dispersing the bacterial killing chemicalinto a stream of water flowing through said first container; and asecond container, said second container proximate said first containerwith said first container and second container separate from each otherto permit removable of one or the other therefrom said second containerholding a water treatment material therein, said second container havingan inlet and an outlet to allow water to flow into and out of the secondcontainer to thereby dispense the water treatment material therein intothe water system whereby the first and second container are located in adispersal valve for directing a stream of water therethrough.